2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/types.h>
36 #include <linux/kernel.h>
37 #include <linux/string.h>
38 #include <linux/errno.h>
39 #include <linux/percpu.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/skbuff.h>
42 #include <linux/bitmap.h>
43 #include <net/netlink.h>
44 #include <net/act_api.h>
45 #include <net/pkt_cls.h>
48 struct tc_u_knode __rcu
*next
;
50 struct tc_u_hnode __rcu
*ht_up
;
52 #ifdef CONFIG_NET_CLS_IND
56 struct tcf_result res
;
57 struct tc_u_hnode __rcu
*ht_down
;
58 #ifdef CONFIG_CLS_U32_PERF
59 struct tc_u32_pcnt __percpu
*pf
;
61 #ifdef CONFIG_CLS_U32_MARK
64 u32 __percpu
*pcpu_success
;
68 /* The 'sel' field MUST be the last field in structure to allow for
69 * tc_u32_keys allocated at end of structure.
71 struct tc_u32_sel sel
;
75 struct tc_u_hnode __rcu
*next
;
78 struct tc_u_common
*tp_c
;
82 /* The 'ht' field MUST be the last field in structure to allow for
83 * more entries allocated at end of structure.
85 struct tc_u_knode __rcu
*ht
[1];
89 struct tc_u_hnode __rcu
*hlist
;
96 static inline unsigned int u32_hash_fold(__be32 key
,
97 const struct tc_u32_sel
*sel
,
100 unsigned int h
= ntohl(key
& sel
->hmask
) >> fshift
;
105 static int u32_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
, struct tcf_result
*res
)
108 struct tc_u_knode
*knode
;
110 } stack
[TC_U32_MAXDEPTH
];
112 struct tc_u_hnode
*ht
= rcu_dereference_bh(tp
->root
);
113 unsigned int off
= skb_network_offset(skb
);
114 struct tc_u_knode
*n
;
118 #ifdef CONFIG_CLS_U32_PERF
124 n
= rcu_dereference_bh(ht
->ht
[sel
]);
128 struct tc_u32_key
*key
= n
->sel
.keys
;
130 #ifdef CONFIG_CLS_U32_PERF
131 __this_cpu_inc(n
->pf
->rcnt
);
135 #ifdef CONFIG_CLS_U32_MARK
136 if ((skb
->mark
& n
->mask
) != n
->val
) {
137 n
= rcu_dereference_bh(n
->next
);
140 __this_cpu_inc(*n
->pcpu_success
);
144 for (i
= n
->sel
.nkeys
; i
> 0; i
--, key
++) {
145 int toff
= off
+ key
->off
+ (off2
& key
->offmask
);
148 if (skb_headroom(skb
) + toff
> INT_MAX
)
151 data
= skb_header_pointer(skb
, toff
, 4, &hdata
);
154 if ((*data
^ key
->val
) & key
->mask
) {
155 n
= rcu_dereference_bh(n
->next
);
158 #ifdef CONFIG_CLS_U32_PERF
159 __this_cpu_inc(n
->pf
->kcnts
[j
]);
164 ht
= rcu_dereference_bh(n
->ht_down
);
167 if (n
->sel
.flags
& TC_U32_TERMINAL
) {
170 #ifdef CONFIG_NET_CLS_IND
171 if (!tcf_match_indev(skb
, n
->ifindex
)) {
172 n
= rcu_dereference_bh(n
->next
);
176 #ifdef CONFIG_CLS_U32_PERF
177 __this_cpu_inc(n
->pf
->rhit
);
179 r
= tcf_exts_exec(skb
, &n
->exts
, res
);
181 n
= rcu_dereference_bh(n
->next
);
187 n
= rcu_dereference_bh(n
->next
);
192 if (sdepth
>= TC_U32_MAXDEPTH
)
194 stack
[sdepth
].knode
= n
;
195 stack
[sdepth
].off
= off
;
198 ht
= rcu_dereference_bh(n
->ht_down
);
203 data
= skb_header_pointer(skb
, off
+ n
->sel
.hoff
, 4,
207 sel
= ht
->divisor
& u32_hash_fold(*data
, &n
->sel
,
210 if (!(n
->sel
.flags
& (TC_U32_VAROFFSET
| TC_U32_OFFSET
| TC_U32_EAT
)))
213 if (n
->sel
.flags
& (TC_U32_OFFSET
| TC_U32_VAROFFSET
)) {
214 off2
= n
->sel
.off
+ 3;
215 if (n
->sel
.flags
& TC_U32_VAROFFSET
) {
218 data
= skb_header_pointer(skb
,
223 off2
+= ntohs(n
->sel
.offmask
& *data
) >>
228 if (n
->sel
.flags
& TC_U32_EAT
) {
239 n
= stack
[sdepth
].knode
;
240 ht
= rcu_dereference_bh(n
->ht_up
);
241 off
= stack
[sdepth
].off
;
248 net_warn_ratelimited("cls_u32: dead loop\n");
252 static struct tc_u_hnode
*
253 u32_lookup_ht(struct tc_u_common
*tp_c
, u32 handle
)
255 struct tc_u_hnode
*ht
;
257 for (ht
= rtnl_dereference(tp_c
->hlist
);
259 ht
= rtnl_dereference(ht
->next
))
260 if (ht
->handle
== handle
)
266 static struct tc_u_knode
*
267 u32_lookup_key(struct tc_u_hnode
*ht
, u32 handle
)
270 struct tc_u_knode
*n
= NULL
;
272 sel
= TC_U32_HASH(handle
);
273 if (sel
> ht
->divisor
)
276 for (n
= rtnl_dereference(ht
->ht
[sel
]);
278 n
= rtnl_dereference(n
->next
))
279 if (n
->handle
== handle
)
286 static unsigned long u32_get(struct tcf_proto
*tp
, u32 handle
)
288 struct tc_u_hnode
*ht
;
289 struct tc_u_common
*tp_c
= tp
->data
;
291 if (TC_U32_HTID(handle
) == TC_U32_ROOT
)
292 ht
= rtnl_dereference(tp
->root
);
294 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(handle
));
299 if (TC_U32_KEY(handle
) == 0)
300 return (unsigned long)ht
;
302 return (unsigned long)u32_lookup_key(ht
, handle
);
305 static u32
gen_new_htid(struct tc_u_common
*tp_c
)
309 /* hgenerator only used inside rtnl lock it is safe to increment
310 * without read _copy_ update semantics
313 if (++tp_c
->hgenerator
== 0x7FF)
314 tp_c
->hgenerator
= 1;
315 } while (--i
> 0 && u32_lookup_ht(tp_c
, (tp_c
->hgenerator
|0x800)<<20));
317 return i
> 0 ? (tp_c
->hgenerator
|0x800)<<20 : 0;
320 static int u32_init(struct tcf_proto
*tp
)
322 struct tc_u_hnode
*root_ht
;
323 struct tc_u_common
*tp_c
;
325 tp_c
= tp
->q
->u32_node
;
327 root_ht
= kzalloc(sizeof(*root_ht
), GFP_KERNEL
);
331 root_ht
->divisor
= 0;
333 root_ht
->handle
= tp_c
? gen_new_htid(tp_c
) : 0x80000000;
334 root_ht
->prio
= tp
->prio
;
337 tp_c
= kzalloc(sizeof(*tp_c
), GFP_KERNEL
);
343 tp
->q
->u32_node
= tp_c
;
347 RCU_INIT_POINTER(root_ht
->next
, tp_c
->hlist
);
348 rcu_assign_pointer(tp_c
->hlist
, root_ht
);
349 root_ht
->tp_c
= tp_c
;
351 rcu_assign_pointer(tp
->root
, root_ht
);
356 static int u32_destroy_key(struct tcf_proto
*tp
,
357 struct tc_u_knode
*n
,
360 tcf_exts_destroy(&n
->exts
);
362 n
->ht_down
->refcnt
--;
363 #ifdef CONFIG_CLS_U32_PERF
367 #ifdef CONFIG_CLS_U32_MARK
369 free_percpu(n
->pcpu_success
);
375 /* u32_delete_key_rcu should be called when free'ing a copied
376 * version of a tc_u_knode obtained from u32_init_knode(). When
377 * copies are obtained from u32_init_knode() the statistics are
378 * shared between the old and new copies to allow readers to
379 * continue to update the statistics during the copy. To support
380 * this the u32_delete_key_rcu variant does not free the percpu
383 static void u32_delete_key_rcu(struct rcu_head
*rcu
)
385 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
387 u32_destroy_key(key
->tp
, key
, false);
390 /* u32_delete_key_freepf_rcu is the rcu callback variant
391 * that free's the entire structure including the statistics
392 * percpu variables. Only use this if the key is not a copy
393 * returned by u32_init_knode(). See u32_delete_key_rcu()
394 * for the variant that should be used with keys return from
397 static void u32_delete_key_freepf_rcu(struct rcu_head
*rcu
)
399 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
401 u32_destroy_key(key
->tp
, key
, true);
404 static int u32_delete_key(struct tcf_proto
*tp
, struct tc_u_knode
*key
)
406 struct tc_u_knode __rcu
**kp
;
407 struct tc_u_knode
*pkp
;
408 struct tc_u_hnode
*ht
= rtnl_dereference(key
->ht_up
);
411 kp
= &ht
->ht
[TC_U32_HASH(key
->handle
)];
412 for (pkp
= rtnl_dereference(*kp
); pkp
;
413 kp
= &pkp
->next
, pkp
= rtnl_dereference(*kp
)) {
415 RCU_INIT_POINTER(*kp
, key
->next
);
417 tcf_unbind_filter(tp
, &key
->res
);
418 call_rcu(&key
->rcu
, u32_delete_key_freepf_rcu
);
427 static void u32_clear_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
429 struct tc_u_knode
*n
;
432 for (h
= 0; h
<= ht
->divisor
; h
++) {
433 while ((n
= rtnl_dereference(ht
->ht
[h
])) != NULL
) {
434 RCU_INIT_POINTER(ht
->ht
[h
],
435 rtnl_dereference(n
->next
));
436 tcf_unbind_filter(tp
, &n
->res
);
437 call_rcu(&n
->rcu
, u32_delete_key_freepf_rcu
);
442 static int u32_destroy_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
444 struct tc_u_common
*tp_c
= tp
->data
;
445 struct tc_u_hnode __rcu
**hn
;
446 struct tc_u_hnode
*phn
;
450 u32_clear_hnode(tp
, ht
);
453 for (phn
= rtnl_dereference(*hn
);
455 hn
= &phn
->next
, phn
= rtnl_dereference(*hn
)) {
457 RCU_INIT_POINTER(*hn
, ht
->next
);
466 static bool ht_empty(struct tc_u_hnode
*ht
)
470 for (h
= 0; h
<= ht
->divisor
; h
++)
471 if (rcu_access_pointer(ht
->ht
[h
]))
477 static bool u32_destroy(struct tcf_proto
*tp
, bool force
)
479 struct tc_u_common
*tp_c
= tp
->data
;
480 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
482 WARN_ON(root_ht
== NULL
);
486 if (root_ht
->refcnt
> 1)
488 if (root_ht
->refcnt
== 1) {
489 if (!ht_empty(root_ht
))
495 if (root_ht
&& --root_ht
->refcnt
== 0)
496 u32_destroy_hnode(tp
, root_ht
);
498 if (--tp_c
->refcnt
== 0) {
499 struct tc_u_hnode
*ht
;
501 tp
->q
->u32_node
= NULL
;
503 for (ht
= rtnl_dereference(tp_c
->hlist
);
505 ht
= rtnl_dereference(ht
->next
)) {
507 u32_clear_hnode(tp
, ht
);
510 while ((ht
= rtnl_dereference(tp_c
->hlist
)) != NULL
) {
511 RCU_INIT_POINTER(tp_c
->hlist
, ht
->next
);
522 static int u32_delete(struct tcf_proto
*tp
, unsigned long arg
)
524 struct tc_u_hnode
*ht
= (struct tc_u_hnode
*)arg
;
525 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
530 if (TC_U32_KEY(ht
->handle
))
531 return u32_delete_key(tp
, (struct tc_u_knode
*)ht
);
536 if (ht
->refcnt
== 1) {
538 u32_destroy_hnode(tp
, ht
);
546 #define NR_U32_NODE (1<<12)
547 static u32
gen_new_kid(struct tc_u_hnode
*ht
, u32 handle
)
549 struct tc_u_knode
*n
;
551 unsigned long *bitmap
= kzalloc(BITS_TO_LONGS(NR_U32_NODE
) * sizeof(unsigned long),
554 return handle
| 0xFFF;
556 for (n
= rtnl_dereference(ht
->ht
[TC_U32_HASH(handle
)]);
558 n
= rtnl_dereference(n
->next
))
559 set_bit(TC_U32_NODE(n
->handle
), bitmap
);
561 i
= find_next_zero_bit(bitmap
, NR_U32_NODE
, 0x800);
562 if (i
>= NR_U32_NODE
)
563 i
= find_next_zero_bit(bitmap
, NR_U32_NODE
, 1);
566 return handle
| (i
>= NR_U32_NODE
? 0xFFF : i
);
569 static const struct nla_policy u32_policy
[TCA_U32_MAX
+ 1] = {
570 [TCA_U32_CLASSID
] = { .type
= NLA_U32
},
571 [TCA_U32_HASH
] = { .type
= NLA_U32
},
572 [TCA_U32_LINK
] = { .type
= NLA_U32
},
573 [TCA_U32_DIVISOR
] = { .type
= NLA_U32
},
574 [TCA_U32_SEL
] = { .len
= sizeof(struct tc_u32_sel
) },
575 [TCA_U32_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
576 [TCA_U32_MARK
] = { .len
= sizeof(struct tc_u32_mark
) },
579 static int u32_set_parms(struct net
*net
, struct tcf_proto
*tp
,
580 unsigned long base
, struct tc_u_hnode
*ht
,
581 struct tc_u_knode
*n
, struct nlattr
**tb
,
582 struct nlattr
*est
, bool ovr
)
587 tcf_exts_init(&e
, TCA_U32_ACT
, TCA_U32_POLICE
);
588 err
= tcf_exts_validate(net
, tp
, tb
, est
, &e
, ovr
);
593 if (tb
[TCA_U32_LINK
]) {
594 u32 handle
= nla_get_u32(tb
[TCA_U32_LINK
]);
595 struct tc_u_hnode
*ht_down
= NULL
, *ht_old
;
597 if (TC_U32_KEY(handle
))
601 ht_down
= u32_lookup_ht(ht
->tp_c
, handle
);
608 ht_old
= rtnl_dereference(n
->ht_down
);
609 rcu_assign_pointer(n
->ht_down
, ht_down
);
614 if (tb
[TCA_U32_CLASSID
]) {
615 n
->res
.classid
= nla_get_u32(tb
[TCA_U32_CLASSID
]);
616 tcf_bind_filter(tp
, &n
->res
, base
);
619 #ifdef CONFIG_NET_CLS_IND
620 if (tb
[TCA_U32_INDEV
]) {
622 ret
= tcf_change_indev(net
, tb
[TCA_U32_INDEV
]);
628 tcf_exts_change(tp
, &n
->exts
, &e
);
632 tcf_exts_destroy(&e
);
636 static void u32_replace_knode(struct tcf_proto
*tp
,
637 struct tc_u_common
*tp_c
,
638 struct tc_u_knode
*n
)
640 struct tc_u_knode __rcu
**ins
;
641 struct tc_u_knode
*pins
;
642 struct tc_u_hnode
*ht
;
644 if (TC_U32_HTID(n
->handle
) == TC_U32_ROOT
)
645 ht
= rtnl_dereference(tp
->root
);
647 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(n
->handle
));
649 ins
= &ht
->ht
[TC_U32_HASH(n
->handle
)];
651 /* The node must always exist for it to be replaced if this is not the
652 * case then something went very wrong elsewhere.
654 for (pins
= rtnl_dereference(*ins
); ;
655 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
656 if (pins
->handle
== n
->handle
)
659 RCU_INIT_POINTER(n
->next
, pins
->next
);
660 rcu_assign_pointer(*ins
, n
);
663 static struct tc_u_knode
*u32_init_knode(struct tcf_proto
*tp
,
664 struct tc_u_knode
*n
)
666 struct tc_u_knode
*new;
667 struct tc_u32_sel
*s
= &n
->sel
;
669 new = kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
),
675 RCU_INIT_POINTER(new->next
, n
->next
);
676 new->handle
= n
->handle
;
677 RCU_INIT_POINTER(new->ht_up
, n
->ht_up
);
679 #ifdef CONFIG_NET_CLS_IND
680 new->ifindex
= n
->ifindex
;
682 new->fshift
= n
->fshift
;
684 RCU_INIT_POINTER(new->ht_down
, n
->ht_down
);
686 /* bump reference count as long as we hold pointer to structure */
688 new->ht_down
->refcnt
++;
690 #ifdef CONFIG_CLS_U32_PERF
691 /* Statistics may be incremented by readers during update
692 * so we must keep them in tact. When the node is later destroyed
693 * a special destroy call must be made to not free the pf memory.
698 #ifdef CONFIG_CLS_U32_MARK
701 /* Similarly success statistics must be moved as pointers */
702 new->pcpu_success
= n
->pcpu_success
;
705 memcpy(&new->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
707 tcf_exts_init(&new->exts
, TCA_U32_ACT
, TCA_U32_POLICE
);
712 static int u32_change(struct net
*net
, struct sk_buff
*in_skb
,
713 struct tcf_proto
*tp
, unsigned long base
, u32 handle
,
715 unsigned long *arg
, bool ovr
)
717 struct tc_u_common
*tp_c
= tp
->data
;
718 struct tc_u_hnode
*ht
;
719 struct tc_u_knode
*n
;
720 struct tc_u32_sel
*s
;
721 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
722 struct nlattr
*tb
[TCA_U32_MAX
+ 1];
725 #ifdef CONFIG_CLS_U32_PERF
730 return handle
? -EINVAL
: 0;
732 err
= nla_parse_nested(tb
, TCA_U32_MAX
, opt
, u32_policy
);
736 n
= (struct tc_u_knode
*)*arg
;
738 struct tc_u_knode
*new;
740 if (TC_U32_KEY(n
->handle
) == 0)
743 new = u32_init_knode(tp
, n
);
747 err
= u32_set_parms(net
, tp
, base
,
748 rtnl_dereference(n
->ht_up
), new, tb
,
752 u32_destroy_key(tp
, new, false);
756 u32_replace_knode(tp
, tp_c
, new);
757 tcf_unbind_filter(tp
, &n
->res
);
758 call_rcu(&n
->rcu
, u32_delete_key_rcu
);
762 if (tb
[TCA_U32_DIVISOR
]) {
763 unsigned int divisor
= nla_get_u32(tb
[TCA_U32_DIVISOR
]);
765 if (--divisor
> 0x100)
767 if (TC_U32_KEY(handle
))
770 handle
= gen_new_htid(tp
->data
);
774 ht
= kzalloc(sizeof(*ht
) + divisor
*sizeof(void *), GFP_KERNEL
);
779 ht
->divisor
= divisor
;
782 RCU_INIT_POINTER(ht
->next
, tp_c
->hlist
);
783 rcu_assign_pointer(tp_c
->hlist
, ht
);
784 *arg
= (unsigned long)ht
;
788 if (tb
[TCA_U32_HASH
]) {
789 htid
= nla_get_u32(tb
[TCA_U32_HASH
]);
790 if (TC_U32_HTID(htid
) == TC_U32_ROOT
) {
791 ht
= rtnl_dereference(tp
->root
);
794 ht
= u32_lookup_ht(tp
->data
, TC_U32_HTID(htid
));
799 ht
= rtnl_dereference(tp
->root
);
803 if (ht
->divisor
< TC_U32_HASH(htid
))
807 if (TC_U32_HTID(handle
) && TC_U32_HTID(handle
^htid
))
809 handle
= htid
| TC_U32_NODE(handle
);
811 handle
= gen_new_kid(ht
, htid
);
813 if (tb
[TCA_U32_SEL
] == NULL
)
816 s
= nla_data(tb
[TCA_U32_SEL
]);
818 n
= kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
), GFP_KERNEL
);
822 #ifdef CONFIG_CLS_U32_PERF
823 size
= sizeof(struct tc_u32_pcnt
) + s
->nkeys
* sizeof(u64
);
824 n
->pf
= __alloc_percpu(size
, __alignof__(struct tc_u32_pcnt
));
831 memcpy(&n
->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
832 RCU_INIT_POINTER(n
->ht_up
, ht
);
834 n
->fshift
= s
->hmask
? ffs(ntohl(s
->hmask
)) - 1 : 0;
835 tcf_exts_init(&n
->exts
, TCA_U32_ACT
, TCA_U32_POLICE
);
838 #ifdef CONFIG_CLS_U32_MARK
839 n
->pcpu_success
= alloc_percpu(u32
);
840 if (!n
->pcpu_success
) {
845 if (tb
[TCA_U32_MARK
]) {
846 struct tc_u32_mark
*mark
;
848 mark
= nla_data(tb
[TCA_U32_MARK
]);
850 n
->mask
= mark
->mask
;
854 err
= u32_set_parms(net
, tp
, base
, ht
, n
, tb
, tca
[TCA_RATE
], ovr
);
856 struct tc_u_knode __rcu
**ins
;
857 struct tc_u_knode
*pins
;
859 ins
= &ht
->ht
[TC_U32_HASH(handle
)];
860 for (pins
= rtnl_dereference(*ins
); pins
;
861 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
862 if (TC_U32_NODE(handle
) < TC_U32_NODE(pins
->handle
))
865 RCU_INIT_POINTER(n
->next
, pins
);
866 rcu_assign_pointer(*ins
, n
);
868 *arg
= (unsigned long)n
;
872 #ifdef CONFIG_CLS_U32_MARK
873 free_percpu(n
->pcpu_success
);
877 #ifdef CONFIG_CLS_U32_PERF
884 static void u32_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
886 struct tc_u_common
*tp_c
= tp
->data
;
887 struct tc_u_hnode
*ht
;
888 struct tc_u_knode
*n
;
894 for (ht
= rtnl_dereference(tp_c
->hlist
);
896 ht
= rtnl_dereference(ht
->next
)) {
897 if (ht
->prio
!= tp
->prio
)
899 if (arg
->count
>= arg
->skip
) {
900 if (arg
->fn(tp
, (unsigned long)ht
, arg
) < 0) {
906 for (h
= 0; h
<= ht
->divisor
; h
++) {
907 for (n
= rtnl_dereference(ht
->ht
[h
]);
909 n
= rtnl_dereference(n
->next
)) {
910 if (arg
->count
< arg
->skip
) {
914 if (arg
->fn(tp
, (unsigned long)n
, arg
) < 0) {
924 static int u32_dump(struct net
*net
, struct tcf_proto
*tp
, unsigned long fh
,
925 struct sk_buff
*skb
, struct tcmsg
*t
)
927 struct tc_u_knode
*n
= (struct tc_u_knode
*)fh
;
928 struct tc_u_hnode
*ht_up
, *ht_down
;
934 t
->tcm_handle
= n
->handle
;
936 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
938 goto nla_put_failure
;
940 if (TC_U32_KEY(n
->handle
) == 0) {
941 struct tc_u_hnode
*ht
= (struct tc_u_hnode
*)fh
;
942 u32 divisor
= ht
->divisor
+ 1;
944 if (nla_put_u32(skb
, TCA_U32_DIVISOR
, divisor
))
945 goto nla_put_failure
;
947 #ifdef CONFIG_CLS_U32_PERF
948 struct tc_u32_pcnt
*gpf
;
952 if (nla_put(skb
, TCA_U32_SEL
,
953 sizeof(n
->sel
) + n
->sel
.nkeys
*sizeof(struct tc_u32_key
),
955 goto nla_put_failure
;
957 ht_up
= rtnl_dereference(n
->ht_up
);
959 u32 htid
= n
->handle
& 0xFFFFF000;
960 if (nla_put_u32(skb
, TCA_U32_HASH
, htid
))
961 goto nla_put_failure
;
963 if (n
->res
.classid
&&
964 nla_put_u32(skb
, TCA_U32_CLASSID
, n
->res
.classid
))
965 goto nla_put_failure
;
967 ht_down
= rtnl_dereference(n
->ht_down
);
969 nla_put_u32(skb
, TCA_U32_LINK
, ht_down
->handle
))
970 goto nla_put_failure
;
972 #ifdef CONFIG_CLS_U32_MARK
973 if ((n
->val
|| n
->mask
)) {
974 struct tc_u32_mark mark
= {.val
= n
->val
,
979 for_each_possible_cpu(cpum
) {
980 __u32 cnt
= *per_cpu_ptr(n
->pcpu_success
, cpum
);
985 if (nla_put(skb
, TCA_U32_MARK
, sizeof(mark
), &mark
))
986 goto nla_put_failure
;
990 if (tcf_exts_dump(skb
, &n
->exts
) < 0)
991 goto nla_put_failure
;
993 #ifdef CONFIG_NET_CLS_IND
995 struct net_device
*dev
;
996 dev
= __dev_get_by_index(net
, n
->ifindex
);
997 if (dev
&& nla_put_string(skb
, TCA_U32_INDEV
, dev
->name
))
998 goto nla_put_failure
;
1001 #ifdef CONFIG_CLS_U32_PERF
1002 gpf
= kzalloc(sizeof(struct tc_u32_pcnt
) +
1003 n
->sel
.nkeys
* sizeof(u64
),
1006 goto nla_put_failure
;
1008 for_each_possible_cpu(cpu
) {
1010 struct tc_u32_pcnt
*pf
= per_cpu_ptr(n
->pf
, cpu
);
1012 gpf
->rcnt
+= pf
->rcnt
;
1013 gpf
->rhit
+= pf
->rhit
;
1014 for (i
= 0; i
< n
->sel
.nkeys
; i
++)
1015 gpf
->kcnts
[i
] += pf
->kcnts
[i
];
1018 if (nla_put(skb
, TCA_U32_PCNT
,
1019 sizeof(struct tc_u32_pcnt
) + n
->sel
.nkeys
*sizeof(u64
),
1022 goto nla_put_failure
;
1028 nla_nest_end(skb
, nest
);
1030 if (TC_U32_KEY(n
->handle
))
1031 if (tcf_exts_dump_stats(skb
, &n
->exts
) < 0)
1032 goto nla_put_failure
;
1036 nla_nest_cancel(skb
, nest
);
1040 static struct tcf_proto_ops cls_u32_ops __read_mostly
= {
1042 .classify
= u32_classify
,
1044 .destroy
= u32_destroy
,
1046 .change
= u32_change
,
1047 .delete = u32_delete
,
1050 .owner
= THIS_MODULE
,
1053 static int __init
init_u32(void)
1055 pr_info("u32 classifier\n");
1056 #ifdef CONFIG_CLS_U32_PERF
1057 pr_info(" Performance counters on\n");
1059 #ifdef CONFIG_NET_CLS_IND
1060 pr_info(" input device check on\n");
1062 #ifdef CONFIG_NET_CLS_ACT
1063 pr_info(" Actions configured\n");
1065 return register_tcf_proto_ops(&cls_u32_ops
);
1068 static void __exit
exit_u32(void)
1070 unregister_tcf_proto_ops(&cls_u32_ops
);
1073 module_init(init_u32
)
1074 module_exit(exit_u32
)
1075 MODULE_LICENSE("GPL");